Valved piston



L. THARP VALVED PISTON Filed July 31. 1922 2 SheebS-Sheeb l abtozwujNov. 6, 1923. 1,472,947

' v L.. THARF VALVED PISTON Filed July 31, 1922 2 Sheets-Sheet 2 f maPatented Nov. 6, 1923.

LEE THARP, or BURLINGTON, iowa.

VALVED PISTON.

Application led July 31,

To all whom t may concern.'

Be it known that I, LEE THARP, a citizen of the United States, residingat Burlington, in the county of Des Moines and State of owa, haveinvented new and useful VImprovements in V alved Pistons, of which thefollowing is a specification'.

@ne of the Vobjects of my said invention is the provision of simple,durable and highly efficient valved pistons for single or doublecylinder air pumps.

Another object of the invention is the provision of a compound air pumpcharacterized by my novel valved pistons.

To the attainment of the foregoing, the nvention consists in theimprovement as hereinafter described and definitely claimed.

In the accompanying drawings, forming part of this speciiicatin:-

Figure 1 is a view, partly in vertical section and partly in elevationof so much of a compound air pump as is necessary toY illustrate myimprovement.

Figures 2, 3 and 4 are horizontal sections taken in the planes indicatedby the lines 2 2, 3 3 and 4.-4, respectively, of Figure 1, looking inthe directions indicated by arrows.

Similar numerals of reference designate corresponding parts in all ofthe views of the drawings.

The pump illustrated comprises a base 1 with a conduit 2 in associationwith a large cylinder 3 and a compzratively small cvlinder 4, the saidcylinder 4 being provided with an appropriate eduction conduit, and thetwo cylinders being connected at their lower ends by the beforementioned conduit 2.

In the cylinders 3 and 4 are piston rods 5 and 6, respectively. andthreaded on the said rods 5 and 6 are the bodies 7 and 8, respectively,of my novel valve units, said units being readily attachable anddetachable. The body 7 of the unit in the large cylinder 3 is providedwith a pendent stem 9 and threaded on the said stem 9 is a metallicplate 10 arranged with its perimeter spaced from the side wall of thecylinder. Also threaded on the stem 9 is a nut 11 and above the said nut11 is arranged a metallic plate 12 that is freely movable on the stem 9between the plate 10 and the nut 11. The said plate 12 is apertured at13, for the passage of air, the said apertures being 1922. Serial No.578,620.

formed by striking up the plate as'indicated by 14, and the struck upportions of the platebeing bent over a flexible packing layer 15 asillustrated so as to strongly'connect said layer 15 to the plate 11,2.The layer 15 is of'such diameter as to provide it with a dependingflange 16 that is interposed between the periphery of the plate 12 andthe wall of thecylinder 3 as illustrated. y

ln addition to the body 8 the other unit referred to comprises a tubularmember 20 threaded into the lower tubular portion 21 of the body 8, anut 22 threaded on the member 20, plates 23 surrounding the tubularmember 20 above the nut 22, and a flexible packing layer l24 interposedand held between the plates 23 and having the flange 25 arranged to wipeagainst the wheel of the cylinder 4 as illustrated. The tubular portionof the body 8 is apertured as indicated by 26 to form a cage or a ballvalve 26 which is adapted to seat in the upper end of the tubular member2O and is freely movable in the said cage.V

It will be manifest from the foregoing that my novel Yunits may beexpeditiously and easily substituted for those now in use in air pumpsof the ordinary construction.

In the practical use of a pump embodying my improvement it will beunderstood that on the up stroke the plate 12 with the packing layer 15thereon will drop tothe nut 11 leaving ample space between the plate 10and the packing layer 15 for air to reach and pass through the apertures13 to a point in the cylinder below the valve` On the down Ward strokethe plate 10 will bear solidly against the layer 15 of leatheror otherappropriate material. It will also be observed that on the downwardstroke the valve in the cylinder 3 will Vforce air through the conduit 2and into the small cylinder 4 vand up through the tubular member 20 andpast the valve27 so as to force compressed air vinto the cylinder 4 andoutthroughthe eduction `opening thereof. Again. on thev up stroke itwill be noted that the valve 27 will be seated and make an air tightjoint at the same time that the latter Vlayer 25 is tight against thewall of the cylinder 4. Manifestly at this time the valve in thecylindery 3 will be open as shown for the filling of the cylinder withair, the air passing downwardly through the space about the plate l0. Inthe small valve the air has an easy passage ln addition to the practicaladvantages ascribed to my improvement it will be appre ciated thatV apump embodying` the same is at once easily operable and powerful.

I have entered into a detailed description of the construction andrelative arrangement of the parts embraced in the present and preferredembodiment of my invention in order to impart a full, clear and exactunderstanding of the said embodiment. I do not desire, however, to beunderstood as conining myself to the specific construction and relativearrangement of parts inasmuch as in the future practice of the inventionvarious changes and modifications may be made such as fall within thescope of my invention as defined in my appended claim.

Having described my invention, what l claim and desire to secure byLetters Patent is zvalve unit comprising a body adapted for yconnectionto a rod and having a stem, a-

plate fixed to said stem, an apertured plate movable on the stem, anapertured flexible layer secured on the apertured plate, and meansretaining the apertured plate and the flexible layer on the stem-5 thesaid apertured plate having struck-up portions about its apertures, andsaid struck-up portions serving to attach the flexible plate.

n testimony whereof, afliX my signature.

LEE THARP.

